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Old 10th July 2012, 01:02 PM   #951
BrianDonegan is offline BrianDonegan  United States
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Twisted Pear Audio - Buffalo32S (ES9018 DAC)
It is normal.

1 is the switch number (kinda silly that it's there, since there is only one switch), and ON is the switch position indicator.
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Old 23rd July 2012, 04:25 PM   #952
nattonrice is offline nattonrice  United States
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Originally Posted by Russ White View Post
I actually think that DAC is some of my best work, and I am seriously thinking of bringing it back, but slightly revised.
I was poking around inside of mine earlier today and I'd say this is spot on, it's a great all-in-one.
A drop in revision (with say, onboard tridents) would be very cool
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Old 20th April 2013, 07:57 PM   #953
FJC Corpas is offline FJC Corpas  Spain
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Default Help with a Buffalo 32s channel not working

One channel of my Buf32s is not working.

I've tested the outputs (both channels) with an oscilloscope. I have used a CD track with a 1kHz signal and one channel shows the signal ok, as it should be. However the other channel shows no AC signal, instead appear 13.8Vdc between + and GND and -7.9Vdc between - and gnd.

Seems clear that the analog part of the buff32 is failing . Could someone please help me?
Since the scheme is not available I guess Brian and/or Russ would know with more certainty that may be failing.

The configuration of the dac is very simple. I use spdif input and SE output (signal taken from + and gnd) and two Placid BP one per channel (+/-15V and 200mA supply current configuration) and one Placid for Digital (5.20V and 200mA supply current configuration) . Attached is a pic of the dac.

Click the image to open in full size.
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Old 20th April 2013, 09:29 PM   #954
Russ White is offline Russ White  United States
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That's a nice clean DAC. Good work. My suspicion is that an op-amp has gone bad. I am out of town at the moment, but when I get back I will try to help you identify which one by giving you some test points.

Cheers!
Russ
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Old 21st April 2013, 10:17 AM   #955
FJC Corpas is offline FJC Corpas  Spain
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Thanks Russ!! I'll be waiting for your expert help.
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Old 27th April 2013, 10:52 AM   #956
FJC Corpas is offline FJC Corpas  Spain
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Quote:
Originally Posted by Russ White View Post
That's a nice clean DAC. Good work. My suspicion is that an op-amp has gone bad. I am out of town at the moment, but when I get back I will try to help you identify which one by giving you some test points.

Cheers!
Russ
Russ, please do not forget my question...
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Old 27th April 2013, 03:10 PM   #957
Russ White is offline Russ White  United States
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First thing to do is to measure at the outputs of each opamp.
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Old 27th April 2013, 08:36 PM   #958
FJC Corpas is offline FJC Corpas  Spain
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Ok. I can see two OPA1632 one LM4562 and one LME49710. Do you mean the output of all these opamps?
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Old 27th April 2013, 08:52 PM   #959
Russ White is offline Russ White  United States
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Most interested the LM4562 and the LME49710 for now.
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Old 27th April 2013, 09:23 PM   #960
Russ White is offline Russ White  United States
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Actually lets move this to the support forum.
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